power

If a force F^→ = ((3i + 4j + 5k ) Newtons is acting on a particle moving on a circle of radius 2m with a speed increasing at the rate of 2ms^-2. All points on the circle satisfy the equation 3x+ 4y + 5z = 0. The power of the force on the particle

(A) increase with time (B) Decreases with time
(C) Is constant (D) Zero